JEE Main 2022PhysicsRay OpticsEasyMCQ

JEE Main 2022 — Ray Optics Question with Solution

JEE Main 2022 (25 Jul Shift 1)

Question

Time taken by light to travel in two different materials A and B of refractive indices μA and μB of same thickness is t1 and t2 respectively. If t2-t1=5×10-10s and the ratio of μA to μB is 1:2. Then the thickness of material, in meter is: (Given vA and vB are velocities of light in A and B materials respectively).

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Show full solutionCorrect option: A
Correct answer
A5×10-10vA m

Step-by-step explanation

The speed of light in a medium is inversely proportional to the refractive index of the material. Therefore,

μAμB=vBvA=12

Let the thickness is d

⇒t2-t1=dvB-dvA=5×10-10 s

As vA=2vB⇒d=5×10-10×2vB

⇒d=5×10-10×vA m. 

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About this question

This is a previous-year question from JEE Main 2022, covering the Ray Optics chapter of Physics. PrepSharp catalogues every PYQ from JEE Main with a verified answer key and step-by-step solution prepared by IIT alumni — so you can search by chapter, topic or year and revise efficiently.